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Controlling stepper direction with a button

Former Member

I am trying to control a unipolar stepper with two buttons, one on either side of a salvaged typwriter cage. The sketch will run it one one direction but the

button does not reverse the motor. Thanks for advise.

 

#include <Stepper.h>

Stepper s(20,8,9,10,11);

int button1 = 1;

int button2 = 2;

int buttonState1 = 0;

int buttonState2 = 0;

 

 

void setup()

{

pinMode(1,INPUT); //buttons

pinMode(2,INPUT);

 

pinMode(8,OUTPUT);

pinMode(9,OUTPUT);

pinMode(10,OUTPUT);

pinMode(11,OUTPUT);

 

 

s.setSpeed(500);

s.step(1500); // This is well beyond the max range but I assumed that when the carriage hit the button, it would reverse.   

//delay(5000);

}

 

 

void loop()

{

buttonState1 = digitalRead(button1);

buttonState2 = digitalRead(button2);

 

 

if (buttonState1 == HIGH)

{

s.setSpeed(-500);

s.step(1500);//200

//delay(1000);

}

 

 

if (buttonState2 == HIGH)

{

s.setSpeed(500);

s.step(-1500);

delay(1000);

}

 

 

 

 

}

Parents

  • I tried another approach but the carriage will only move as far as "stepsPerRevolution" will permit. The mechanism must move freely from one button to the next. The far left blue pressure button can be seen in this photo. http://www.flickr.com/photos/50454200@N06/8508893686/

     

     

     

    #include <Stepper.h>

     

     

    int button1 = 1;

    int button2 = 2;

    int buttonState1 = 0;

    int buttonState2 = 0;

     

     

    const int stepsPerRevolution = 100; 

     

     

    Stepper myStepper(stepsPerRevolution, 8,9,10,11);           

     

     

    void setup() {

      pinMode (button1,INPUT);

      pinMode (button2,INPUT);

      // set the speed at 60 rpm:

      myStepper.setSpeed(80);

      myStepper.step(stepsPerRevolution);

      //delay(500);

      

    }

    void loop() {

      buttonState1 = digitalRead (button1);

      buttonState2 = digitalRead (button2);

      if(buttonState2 == HIGH)

      {

      // step one revolution  in one direction:

      myStepper.step(stepsPerRevolution);

      //delay(500);

      }

     

      if (buttonState1 == HIGH)

      {

       // step one revolution in the other direction:

      myStepper.step(-stepsPerRevolution);

      //delay(500);

      }

    }

  • in reply to Former Member

    Are you trying to get this to run automatically from side to side using those blue buttons as limits?

  • in reply to colecago

    Keith

    If I'm not mistaken you have a button1 on Pin 1 which is the Tx.

     

    While its possible to use this pin, you should try to leave it available for debugging.

     

    Your photo is not a lot of help to see how you have wired the buttons.

     

    Are you switching 5v onto the pin, or pulling the pin to ground.?

    If you are pulling the pin to ground you need to have the pullups activated by adding

    digitalWrite (button1, HIGH);

    digitalWrite (button2, HIGH);

    or use external pullup resistors.

     

    I would suggest shifting the button pins, and adding some debugging output

     

    #include <Stepper.h>

     

    int button1 = 1;

    int button2 = 2;

    int buttonState1 = 0;

    int buttonState2 = 0;

     

    const int stepsPerRevolution = 100; 

     

    Stepper myStepper(stepsPerRevolution, 8,9,10,11);           

     

    void setup() {

      Serial.begin(9600);

      pinMode (button2,INPUT);               //shift to pin 2

      pinMode (button3,INPUT);               //shift to pin 3

      // set the speed at 60 rpm:

      myStepper.setSpeed(80);

      myStepper.step(stepsPerRevolution);

      //delay(500);

      

    }

    void loop() {

      buttonState1 = digitalRead (button1);

      buttonState2 = digitalRead (button2);

      if(buttonState2 == HIGH)

      {

          Serial.println("button2 detected");               //add this to see if the button is detected

      // step one revolution  in one direction:

      myStepper.step(stepsPerRevolution);

      //delay(500);

      }

     

      if (buttonState1 == HIGH)

      {

          Serial.println("button1 detected");            //add this to see if the button is detected

       // step one revolution in the other direction:

      myStepper.step(-stepsPerRevolution);

      //delay(500);

      }

    }

     

     

     

     

    mark

  • in reply to mcb1

    Mark,

       The buttons will stop the motor, but not reverse it.

     

    Keith

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